aw: Fix invalidate getting lost

android_webview/browser/browser_view_renderer.h

Index: android_webview/browser/browser_view_renderer.h
diff --git a/android_webview/browser/browser_view_renderer.h b/android_webview/browser/browser_view_renderer.h
index 184364478067ffbbf79b495ea6cab2cb7d0eb69e..991075f3acf6e6cb35619cdfa437b821ec00a0ee 100644
--- a/android_webview/browser/browser_view_renderer.h
+++ b/android_webview/browser/browser_view_renderer.h
@@ -207,9 +207,6 @@ class BrowserViewRenderer : public content::SynchronousCompositorClient,
 
   DrawGLInput draw_gl_input_;
 
-  // TODO(boliu): This is a short term solution to support
-  // SynchronousCompositorClient methods called on non-UI thread.
-  base::Lock scroll_offset_dip_lock_;
   // Current scroll offset in CSS pixels.
   gfx::Vector2dF scroll_offset_dip_;
 
@@ -228,6 +225,12 @@ class BrowserViewRenderer : public content::SynchronousCompositorClient,
   size_t num_tiles_;
   size_t num_bytes_;
 
+  // TODO(boliu): This is a short term solution to support
+  // SynchronousCompositorClient methods called on RenderThread. This is only
+  // used on data that must be modified immediately instead of being posted
+  // back to UI.
+  base::Lock render_thread_lock_;
+
   DISALLOW_COPY_AND_ASSIGN(BrowserViewRenderer);
 };